Nikon D4S - Manual (Page 346)

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If On is selected, exposure will lock when the shutter-release
button is pressed halfway.
Choose how long the camera continues to
meter exposure when no operations are
performed. The shutter-speed and aperture
displays in the top control panel and
viewfinder turn off automatically when the
standby timer expires.
Choose a shorter standby timer delay for longer battery life.
c: Timers/AE Lock
c1: Shutter-Release Button AE-L
G button
➜ A Custom Settings menu
c2: Standby Timer
G button
➜ A Custom Settings menu